Pressure indicating and relief device



R. B. SWOPE ET AL.. PRESSRE INDIGATING AND RELIEF DEVICE MmhV 1932.

Filed Aug. lO, 1928 pipe which projects inside the container is cut away at two sides forming overflow openings 42 and 43 respectively. Threaded on the upper end of the pipe 25 is a cap 44 whiclnas shown, comprisesa sleeve 45 and a curved; annular flange 46y forming a mushroom-shaped hood over the top of the pipe 25. An air orifice 47 is provided in the sleeve 45 to afford communication from the top of the pipe 25fand the underside of the flange'46 Secured to the extension 25 immediately below the cup 40 is a pointer member 48 having a split sleeve 49 provided with a vclamp screw 50 for securing the member 48 on the tube 25. The 'central portion of the member 4,8 is provided rwith a sleeve 52 which is slidable on the tube 18 and provided with an indicating pointer which ymoves over a scale 54 preferably etched in the surface of theglass tube 17 vA set screw is provided for the sleeve 52 to hold itin adjusted positions on the'tube 1.8. A collar 56 is fixed on thetube-l8 as an upper limit of movement set screw 55 is loosened and member 48 moved upto the desired ymaximum pressure `for the gas. f The member 48 being rigidly secured to the tube 25, the tube 25 and the container 40 will be moved "alongwith the pointer. Thenfthe set screw 55 isoper'ated to secure the parts inthe desired position.

j llVhengas is introduced through ythe coupling 31, passesthrough the bore 30 into the v"pipe 29 and communicates its pressure to the interior ofthe pipe 18 above the water level. y This pressure r`will lower the level of the liquidin the tube 18 and cause the free level of the liquid to rise equally in the other I., two tubes 17 and 24, kwhich are open to the at-4 mosphere.k f i As .the level in the tube 18 is forced downward by the gas pressure, the level in the tube 17 will beforced upward, rand asits surface is graduated, the height of the water column maybey read directly :and clearly observed. When 'the pressure is greatenough to lower thel level in the tube 1 8 and correspondingly raise the` level in the tube 24 until it ascends the tube'25, -the waterk displaced from the tube 1'8 fwill loverflow through theaperture's 42 and43 and be retained in the container 40.'

flhus ,aV pressure.' somewhat higher than the upperv limit of the scale l54 will not cause liquid to be spilled out of the device as the container 40 is of suflicient capacity to prevent this- When the level of water in the tube 18 has fallen below the passage 37, bubbles of gas will pass therethrough to the pipe 24, through the pipe 25 and out of the air vent passage 47, and thus escape from the apparatus. .,[t should be noted that the passage 37 is higher than the passage 34, so that the escaping gas will always pass up the tube 24 and there is no danger of its passing out the tube 17 and interfering with the reading of the pressure scale etched thereon.

It should be noted that the pressure indicating and relief deviceabove described is peculiarly adapted for use in connection with resuscitation apparatus for administering gas to the lungs of a patient. When the gas is being supplied, the pressure may be instantly read on the scale at all times. Furthermore,

the point 53 being located at the maximum safe pressure which may be imposed upon the lungs of the particular patienty without rupturing the air vesicles, hence, if kthis pressure is exceeded for any cause whatsoever, no injury will result to the patient as the pressure will be automatically relieved by the bubbles of gas passing through the passage 37 and escaping up the relief pipe 24 and out of the bleed ypassage 47.

The hood 46 covers the greater part of the internal diameter of the container 40, and

thus prevents splashing of the liquid, even.

when the maximum ysafe pressure is exceeded. While one embodiment of our invention' has been shown and described in great detail the broad idea of the invention is not limited to any of the details shown, but includes such embodiments as come within the scope of the subjoined claims. Y Having thus described the invention, what is Vclaimed, as new and desired to be secured by yLetters Patent is: l y 1. k1n a manometer, a pressure tube, a graduated indicating tube, an overflow tube and means providing communication between all of said tubes, said overflow tube being connected to said pressure tube above the con- 'los uection with the indicating tube, and an overflow receiverv at the top of said overflow tube comprising a cup into which the overflow tube projects, said overflow tube having lateral discharge apertures within said cup and flanged cap thereabove.

2. In Va manometer, a pressure tube, a graduated indicating tube, an overflow tube and means providing communication between all of said tubes, said overflow tube being con# nected to said pressure tube above the conlao nection with the indicating tube, and an overflow receiver at the top ofy said overflow tube comprising a cup into wh1ch the overflow tube projects, sa1d overflow tube liavmg lateral discharge apertures withiny said cup. and a flanged capthereabove, an air vent being pro- 1,848,233` Y n o 3j Vvided from ythe interior of said cap to the nection with the indicating tube, said overflow tube comprising telescoping sections rela-v tively adjustable to change the height of liquid column at which overflow occurs.

V4. In a inanoineter, a pressure tube, a graduated indicatingtube, and an overflow tube and means providing communication between all of said tubes, said overflow tube being connected to said pressure tube above the connection with Vthe indicating tube, said overiiow tube comprising telescopiii g sections relatively adjustable to change the height of liquid column at which .overflow occurs, anda' pointer on one of ksaid telescoping sections adapted to moveover the graduations of said indicating` tube to indicate the pressure at which overiow occurs.`

5. In a manonieter, a pressure tube, a'gradu# Y ated indicating tube, and an overiiow `tube and means providing communication,between `all of said tubes,'said overflow tube being conn iiected to said pressure tube above the connection with the indicating tube,` said over! How tube comprising telescoping sections relatively'adjustable to change the height of liquid column at which overflow occurs, and an overflow cup carried byone of said sections.

responding pressure, another of said remain-` i inv tubes being open to the atmosphere and adjustable in height.

LIn testimony whereof we hereunto` affix our.

signatures. .c

ROBERT B. SWOPE. n j JOSEPH KREISELMAN.

6. In a manonieter, a pressure tube, a graduated indicatingtube, and an overflow tube and means providing communication between all of said tubes, said overflow tubebeing coni nected to said pressure-tube above the. connection with the indicating tube, said overflow tubev comprising telescoping sections relatively adjustable to change the height of liquid column at whichoverflow occurs, and

a pointer on one of said telescoping sections adapted to move over the graduations of said indicating tube toindicate the presure at which overflow occurs, and an overflow cup carried by the section which carries the pointer.

7. In a manometer, means for mounting a V'plurality of substantially vertically disposed tubes with their lower portions in communii v cation, means for introducing liquid into one y of the tubes to rise to the saine level in all of `the tubes above the communicating parts, one

of said tubes being closed Vat its top, the others being vented to the atmosphere, means for introducing a gas under pressure to the interior of said closed tube at the upper portion thereof, which will lower/the level of liquid in the closed "tube Vand raise the level i in the remainderv of said tubes', means as-'V sociated with yone of said remaining tubes forL indicating the level of the liquid therein, saidy indicating means being calibratedfor the coreisA 

